Texas Instruments TI-89, TI-92

Chapter 6: Basic Function Graphing 121

06BASFUN.DOC TI-89/TI-92 Plus: Basic Function Graphing (English) Susan Gullord Revised: 02/23/01 4:09 PM Printed: 02/23/01 4:18 PM Page 121 of 22

The Zoom factors define the magnification and reduction used by

ZoomIn and ZoomOut.

1. From the „ Zoom menu, select C:SetFactors to display the ZOOM

FACTORS dialog box.

Zoom factors must be ‚ 1, but

they do not have to be integers.

The default setting is 4.

2. Use D and C to highlight the value you want to change. Then:

¦ Type the new value. The old value is cleared automatically

when you begin typing.

— or —

¦ Press A or B to remove the highlighting, and then edit the old

value.

3. Press ¸ (after typing in an input box, you must press ¸

twice) to save any changes and exit the dialog box.

After using various Zoom tools, you may want to return to a previous

viewing window or save the current one.

1. From the „ Zoom menu, select

B:Memory to display its

submenu.

2. Select the applicable item.

Select: To:

1:ZoomPrev Return to the viewing window displayed before

the previous zoom.

2:ZoomSto Save the current viewing window. (The current

Window variable values are stored to the system

variables zxmin, zxmax, etc.)

3:ZoomRcl Recall the viewing window last stored with

ZoomSto.

You can restore the Window variables to their default values at any

time.

From the „ Zoom menu, select 6:ZoomStd.

Changing Zoom

Factors

Tip: To exit without saving

any changes, press

Saving or Recalling

a Viewing Window

Note: You can store only

one set of Window variable

values at a time. Storing a

new set overwrites the old

set.

Restoring the

Standard Viewing

Window